I need to connect a relay to my old truck to turn on the "soon to add" electric fans.
The ECM has an engine coolant temperature sensor that uses the output resistance to determine coolant temperature.
From the service manual, I have this data:
If you can not see the pic above:
__Condition________________|_Engine coolant temperature decided Just as ignition switch is | turned ON or Start_________|_20°C (68°F)_______________________ More than 6 minutes after | ignition ON or Start_______|_80°C (176°F)______________________ | 20 - 80°C (68 - 176°F) Except as shown above______| (Depends on the time)_____________
So, is there a way to get some sort of Relay that would turn a switch ON when Resistance translates to a certain value (like 185°F or so)?
EDIT More Pics!